FSCI 1010U Lecture Notes - Lecture 4: Scanning Electron Microscope, Trace Evidence, Stereo Microscope
21 Feb 2016
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Document Summary
Locard"s exchange principle tells us that: every contact: leaves a trace ! Many different types of transfers: primary: direct contact soil from gravesite embedded in shoe treads, secondary: indirect contact an intermediate object is the site of transfer. Dog car dog hair on human. Quite often the evidence that is transferred is small or even microscopic in size, making analysis quite difficult. Should be of no surprise that our microscope is one of the most important tools of the forensic trace analyst: analysis is typically called microanalysis . The application of a microscope and microscopical techniques to the observation, collection, and analysis of micro-evidence that cannot be clearly observed or analyzed without such devices. Generally deals with samples in the microgram (mg) or milligram (mg) Often operate using different forms of energy: visible, ultraviolet, infrared ,electron. Can get useful information like: morphology: size, shape, etc, analytical data: Light and matter- refer to slide 6 and 7.
